Electrical Conductivity and Defect Structure of Y-doped BaZrO3
- Electrical Conductivity and Defect Structure of Y-doped BaZrO3
- 지호일; 이종호; 김혜령; 손지원; 이해원; 김병국
- Proton conductor; BaZrO3; defect chemistry
- Issue Date
- The 15th International Conference on Solid State Protonic Conductors
- Rare earth doped BaZrO3 is one of the promising proton conducting oxides due to its high proton conductivity and fair chemical stability. However, poor sinterability of doped BaZrO3 has been a critical barrier to be employed as a solid electrolyte of fuel cell. For this reason there have been many efforts to improve the sinterability of doped BaZrO3 by adopting sintering aids such as CuO, ZnO.
In this study, we measured the electrical conductivity of Y doped BaZrO3 (BZY) with- and without a sintering aid, (Cu, Zn) as a function of temperature, oxygen partial pressure and water vapor pressure and investigated the influence of sintering aids on its electrical property and defect structure. For a more quantitative defect structural analysis, proton concentrations were precisely measured by a Thermo-Gravimetric Analysis (TGA). On the basis of conductivity and TGA results, equilibrium concentrations of each ionic and electronic charge carrier was calculated and presented in a three dimensional space (X axis: oxygen partial pressure, Y axis: water vapor pressure, Z axis: ionic & electronic conductivity or concentration of ionic & electronic charge carriers).
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